'''
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
'''
from abc import ABC, abstractmethod

# package org.apache.jena.graph;

'''
 * An interface for expressing a stopping condition on triples, such as in
 * sub-graph extraction.
'''


class TripleBoundary(ABC):
    '''
     * Answer true if this triple is a stopping triple, and whatever search is using
     * this interface should proceed no further.
    '''

    @abstractmethod
    def stopAt(self, t):
        pass

    '''
     * A TripleBoundary without limits - stopAt always returns false.
    '''
    # TripleBoundaryStopNoWhere
    # public static final TripleBoundary stopNowhere = new TripleBoundary() {
    #     @Override
    #     public boolean stopAt(Triple t) {
    #         return false;
    #     }
    # };

    '''
     * A TripleBoundary that stops at triples with anonymous objects.
    '''
    # TripleBoundaryStopNoWhere
    # public static final TripleBoundary stopAtAnonObject = new TripleBoundary() {
    #     @Override
    #     public boolean stopAt(Triple t) {
    #         return t.getObject().isBlank();
    #     }
    # };
